#include<iostream>
#include<cstring>
using namespace std;
class Stu{
     char name[20];
     float score;
     public:
        Stu(char *p,float s){
           strcpy(name,p);
           score=s;
        }
        Stu(){
           score=0;
           strcpy(name,"no name");
        }
        void set(char *p,float s){
           strcpy(name,p);
           score=s;
        }
    friend ostream & operator << (ostream &os, Stu&x) ;
};
ostream & operator << (ostream &os, Stu &x){
     os << "name" << x.name << "\tscore" << x.score <<endl;
     return os;
}
int main(){
     Stu x("Xuu",93.5);
     cout << x;
     return 0;
}
为什么总是出错啊~高手帮忙~

友元的问题,VC++6.0不支持友元,换编译器

#include<iostream>
#include<cstring>
using namespace std;
namespace demo{
class Stu{
     char name[20];
     float score;
     public:
        Stu(char *p,float s){
           strcpy(name,p);
           score=s;
        }
        Stu(){
           score=0;
           strcpy(name,"no name");
        }
        void set(char *p,float s){
           strcpy(name,p);
           score=s;
        }
    friend ostream & operator << (ostream &os, Stu &x) ;
};
ostream & operator << (ostream &os,Stu &x){
     os << "name:" << x.name << "\tscore:" << x.score <<endl;
     return os;
}
}
int main(){
     demo::Stu x("Xuu",93.5);
     cout << x;
     return 0;
}

厉害啊！不过请教下这个是为什么呢？

答案是2楼说的原因,要用命名空间隔开空间污染..用vs系列不存在这个问题..

谢谢啊！！不过为什么会空间污染呢？

因为std空间里面也涉及这个<<重载,编译器解析的时候会出现问题..你看看书吧...呵呵

恩 。。不过不知道看什么书啊。。我都是自己看网上下的教程的，不知道哪本学C++比较好啊

c++ primer plus起步用书..c++ primer比较适合有点基础看

英文的吗？